Trouble with going more is they wear further apart ..I doubt you'll have issues with Iridiums though...Wider gap gives you the potentual to have bigger spark but a smaller gap gives you a stronger spark..Fitting a cdi would help....

NGK recomend closing the gap 0.004" (0.1mm) for every 50 hp over stock your engine has.
I had mine iridiums gapped at 1.4 (stock gap) with no problems, but I am trying a 1.25 gap now.
I think the platinums are gapped 1.1mm stock..

Ditch the iridiums, they are crap on the 5.0. Mine had a slight miss on the dyno above 4000rpm, and a change to stock plugs gapped to 1.1mm and with a good retune from Autotech, i picked up 12rwkw down low and 10 rwkw up top.
Brett

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